Wing wall: (yi qiang) wing wall
A retaining wall set up to ensure the stability of the roadbed slopes on both sides of the culvert or gravity abutment and to guide the river. structure. There are two types of wing walls: straight wall type (perpendicular to the end wall) or splayed type (open and tilted). The latter, also known as the splayed wall, is the most commonly used form. The inclined angle is generally 30 degrees. The construction form of the wing wall is closely related to the topography, fill height and wiring.
Wing walls are side walls located on both sides of the entrance and exit of water-crossing buildings to retain soil and divert water.
The plane layout of the wing wall mainly considers the requirements of flow diversion. For water-crossing buildings with water-retaining tasks, the plan layout of the water-retaining flank walls must also consider the requirements for anti-seepage on the shore. The projected length along the water flow direction is not less than the bedding length. Regardless of the inlet or outlet, the wall should be smooth on the plane and spread out on both sides of the inlet to avoid unfavorable flow patterns such as backflow and vortex in front of the wall. The plane layout of the wing wall includes straight line, broken line and curve, etc., which can be selected according to the flow rate of the inlet and outlet and the terrain conditions. Generally, the inlet wing wall can be a straight line, a broken line or an arc line; the outlet should use an ellipse or other curve with a gradual curvature, and the curvature can gradually increase from the outlet to the downstream. The facade layout of the wing wall facing the water surface includes upright, inclined, and twisted surfaces. The upright and twisted surface types have better water flow conditions. The inclined wing wall has a sudden change in the water crossing section at the connection with the water passage opening. Often causing vortices or even backflow. Large wing walls usually use the upright type, while small and medium-sized wing walls can use the twisted type. The top elevation of the wing wall is determined according to the application requirements of water-crossing buildings. In principle, it needs to be higher than the water level during overflow. It can also be lower than the overflow level when the flow rate is low. When there is a water-retaining task, the top of the water-retaining flank wall should be higher than the maximum water-retaining level.
/view/139229.htm
/z/q96180148.htm